Dry Stone Pitching Sample Clauses

Dry Stone Pitching. The quality of stones for pitching shall be in accordance with above para. The depth of stones shall be about equal to the specified thickness of pitching and shall generally be not less than 0.014 cum. or 0.021 cum. as specified in the appropriate item of USR or other size as ordered by the Engineer-in- charge having regard to the nature of stones being quarried. The small size stones/spalls required for pitching and wedging shall be stones being quarried. The small size stones/spalls required for pitching and wedging shall be brought to the site only to the required extent and they shall not be used in two or more thickness as a substitute for the stones of full thickness. A large amount of the stones for pitching shall be obtained from the required excavation for other parts of the work. Additional rock as required shall be obtained from rock quarries. Over backing of filter as may be specified in the drawing, the boulders shall be placed such that the direction on which the size of boulders is around 22 cm. is placed normal to the surface of under layer. Also the boulders shall be laid with broadest base down and carefully bonded in all directions. After the boulders have been fixed as above, the interstices shall be filled with well fitting smaller size boulders/gravel driven home.